4.0 Equipment Installation Aspects (Section 4.5 On-Rate for Fuel-Fired Equipment)

4.5 On-Rate for Fuel Fired Equipment The contractor shall ensure the equipment combustion is “on-rate”, for gas-fired or oil-fired equipment, and is at the equipment nameplate value.

Combustion Appliances Gas appliance requirements similar but different than oil appliance requirements.

Oil Burner Smoke Test

Traditional Combustion Testing Kit

Electronic Combustion Testing Kit

Oil Nozzle Sizing & Spray Angle Pattern

Temperature Rise Method (oil appliances) Air Temperature difference between the Warm Air Supply Plenum and the Return Air Plenum

On-Rate On-Rate (also known as fuel flow rate): refers to volume of fuel flowing into the combustion process at steady-state operation. Once the measured flow is corrected for temperature and altitude, the on-rate can be established. For oil on-rate is rated in Btu/gal For gas it rated in Btu/ft 3

On-Rate For Combustion Appliances Gas Appliances: Clocking the meter, and Furnace Temperature Rise, or Combustion Analysis Per OEM Directions Oil Appliances Verify OEM Compliant Nozzle, and Verify oil pump pressure, and Furnace temperature Rise, or Combustion Analysis Per OEM Directions

Gas Combustion Appliances

On-Rate For Gas Combustion Appliances Clocking the meter per OEM instructions And Measuring Temperature Rise Or Perform a combustion analysis per OEM instructions

Gas Pressure

Gas Pressure Measurement Connect to test port

Gas Pressure Measurement

Gas Pressure Adjustment

Typical OEM Instructions

Typical OEM DATA

Manifold Gas Pressure

Manifold Pressure

Typical OEM Tests

Clocking The Gas Meter

Digital Gas Meter

4.0 Equipment Installation Aspects (Section 4.6 Combustion Venting System)

Acceptable Procedures Comparison of installation to appropriate gas venting tables for Category I vent systems Or Comparison of installation to appropriate gas venting tables for Category II, III, and IV vent systems

Appliance Vent Category National Fuel Gas and ANSI Appliance Venting Categories Appliance Vent Type Condensing/Non- Condensing Vent Pressure Common Vent Material Category INon-Condensing Non- Positive B-Vent Category IICondensing Non- Positive Special Per Manufacturer Category IIINon-CondensingPositiveStainless Steel Category IVCondensingPositivePlastic

Appliance Vent Category Category I is for residential and is most common it includes gravity fed and plus 80 furnace models Category II may be required for some residential boilers and wall vented water heaters Category III tank-less water heaters SS duct Category IV high efficiency with plastic pipe

High Efficiency Exhaust Venting Combustion Air Inlet Furnace Direct Vent Installation Exhaust Outlet

Barometric Standard Efficiency

Draft Hood

Combustion Air Outlets/Inlets

Code/OEM Venting Options

Vent Size, Length, And #Elbows

Vent Pipe Slope & Lengths

Code Location Requirements